A three-dimensional numerical analysis is performed to investigate the mechanism whereby a shipping container flows out to the sea due to tsunami-induced incoming and return flows and to examine the effectiveness of countermeasures for preventing the container from flowing out to the sea. It is revealed that the container can flow out to the sea if the upward speed of the container increases and its top surface begins to rotate toward the sea at the termination of its landward motion. Furthermore, it is found that a short countermeasure wall installed at the landward side of the container would be effective in preventing the container from flowing out to the sea.
Ports are expected to serve as bases for supply transportation and rescue operations in case of earthquake and tsunami disasters. However, during the 2011 Tohoku earthquake tsunami, approximately 2,000 shipping containers stored in the Sendai port in Japan flowed out to the sea, and the containers drifting in the sea became navigation barriers to vessels entering and leaving the port to provide supplies to the disaster area. Consequently, countermeasures against tsunami-borne containers are essential for emergency port operations.
|File Size||7 MB||Number of Pages||9|
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